To start with - here's a design for a smelting column base that's quite tidy. Coal feed is from the left or right the design slightly altered for each.
Here's a blueprint for left coal feed:
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That 1 tile gap between columns... It's specific to this mid-game design/instance - so I can align better with train stations as they must tile/align in multiples of 2 tiles e.g. 12 tiles... while these smelting columns are only 11 tiles wide.